31143309971 has 2 divisors, whose sum is σ = 31143309972. Its totient is φ = 31143309970.

The previous prime is 31143309941. The next prime is 31143310027. The reversal of 31143309971 is 17990334113.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31143309971 is a prime.

It is not a weakly prime, because it can be changed into another prime (31143309941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571654985 + 15571654986.

It is an arithmetic number, because the mean of its divisors is an integer number (15571654986).

Almost surely, 2^31143309971 is an apocalyptic number.

31143309971 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143309971 is an equidigital number, since it uses as much as digits as its factorization.

31143309971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 41.

The spelling of 31143309971 in words is "thirty-one billion, one hundred forty-three million, three hundred nine thousand, nine hundred seventy-one".